One aspect to consider is that the actual stall speed will be a function of power due to the propwash over the wing. Stall speed with full (take-off) power is rarely measured in flight and if it is then it will be reduced even more than will result from propwash because a steep nose up attitude will occur which will result in a normal acceleration which is less than 1g. Therefore, in a STOL aircraft take-off the unstick speed may well be below a quoted 1g stall speed for the same configuration because that will inevitably be measured with idle power.
Stall certification for Part 23 aircraft requires stalls to be flown with idle power and with 75% MCP set. I have flown an aircraft in a wings level 75% MCP stall and have been about 45 deg nose up with close to full aileron and full rudder and the ASI pegged solidly on the bottom stop but the wing had not stalled aerodynamically!